/Engine/Source/Runtime/Engine/Public/CanvasRender.h
FCanvasRenderContext ( [FRDGBuilder](API\Runtime\RenderCore\FRDGBuilder) & InGraphBuilder, const [FRenderTarget](API\Runtime\Engine\FRenderTarget) * RenderTarget, FIntRect InViewportRect, FIntRect InScissorRect, bool bScaledToRenderTarget )